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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2588a0b1c4120eea95668ff445f62eab0a61c315dba7134859f1ec7a51425ed' 
  AND token = 'EBxx+Kj5BA3jLZd/O6TyovdwWfovT9V3+TaBk+dyo9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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