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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e17d5659f321a85244b97d9e514c413ae164819ca024be8b967f005ab5b1d6e' 
  AND token = 'Id1PV+TuVMByayr48a1NAELjYa3RjgvHN3IMg1uLVdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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