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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40266b689d7d2769163701ac0275db457a9902a9f9e0158867a39dd7f7502334' 
  AND token = 'jPunU4n/m2mGaxY1sM6eEu5qq597f9uydhnQUEqZPL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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