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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18bf4b763eecd2ffa991462e17f9f17cbdd26c74c3ff3a917b67b7ac61091b2' 
  AND token = 'o02wQ697LegSsWjMeSoyZBehbCBd/wCUEsWiCGwWVCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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