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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f2f235caa8417a0f44ca3dda04711293530c4d0b1fa3ce1a3b09b398819458' 
  AND token = '9lMvSS0Dw6Xf63OFVsNQsa9sYjnDfME13CPIZYvgVkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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