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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d7afcdea1ab57f151cb96f01509d570088a73e8565d872094e4691ba1c03b2' 
  AND token = 'Ty2Wxvk0dXTPeBWB6u9XVzfW2NAOWHM7OhXefWvDlw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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