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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff96bc12ae815c72cbdfcdfe1c265336c8d458dad8fe6c47d258a690f540d63b' 
  AND token = '7ffLl7D0dYm1eX1AgL4zVmlyQMXNSxHScmZdDDbbZn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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