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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62011aa9ea06a232810b8047283e01ebf7d0e9864168a47db9f4cc68cce1c495' 
  AND token = 'FE0frVxGaX12YfirFZ83sRqrV3a5i0mWmT5QUJuTgJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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