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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76f1c20d46a792cceced303eebbfa4417830ff62e44ce1b2738a5bb0a187b0b' 
  AND token = 'oXPk9c/EF1PHud+D+Q7f2npqCfgREKWEZvo+GmQpCOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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