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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd403afa35cf0693df45cbc25b066e0b6c9df9fd06bcb685eacb5c9ce28c11cd5' 
  AND token = 'CZ9RfOTYz5wrU9MeVCa7PIYBoDznGITRJD6QpiarjtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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