SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811568956a88a4c085dd62744dfd2afa4787c1963dcc590e5fdee50f40417b82' 
  AND token = 'lWCNsc3PLJ96/vxl4Canh5jbfuVjPzeKinvUgGy8dbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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