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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56099ec5951ccd2e8cdf1294c35c7a0b0dea7db7820e9a03b0b50d8f28764cbc' 
  AND token = 'ldREqnF0ft/JfWAf9YW0JbNIgIm5zoMCNmU0zt7boLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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