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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc61ca90167028287ffd425adf4d74e05b0c4fdfcf2c341d133f8e75825d365b' 
  AND token = 'K+QCO0sVmXGY66ueaHKLKA1bZORjqbUm7tOxz2yDURU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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