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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d655c699c2c83e29ac2a46b025665b7ebfb49a6795445811bfcbdae90e076e3' 
  AND token = '0raMrMkkZZpVfS3t8Zx/j2pfxUO8+681NptI+UUiFpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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