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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794b6f415da7154cb5766645581f0fa74180fb049ff18fc61eff49ea011f3e72' 
  AND token = 'Iy2CGQGFjYE3mZhNnNMHixaJ6luRSfbOcAV/Cd+mK3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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