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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e1f76b342fcefe9c26776a979088ee3637137512dd09028cb1222abb17968e' 
  AND token = 'DZhewzVpGAvIRZHZGR0piK407JRb0vCz0mCoKXesXes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}