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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231dd6a4d2e3f57d2294f0b1713ccf2ad285d76c59a87ba383574893c2cf42df' 
  AND token = '0eL8tf3diwYzpgvDkhTB2bVqYpCrbtC3UrdYxqpk+sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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