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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dd2dc11c6899fa87b39c3dfc4751a84a0be63a882bbf9285810b85a7d7c263' 
  AND token = 'IpO7unTvF+jB8DWyMTOj8BD4+DYje9BSudHWPY1pLq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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