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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8377c3757f59aa5f071b3c00ae1b076985dcab4493c8a7f1becc1942d157980' 
  AND token = 'GWjoaZL9T4wbQR71MjYfIFMpBgQYLgCK4H/TYKCbVVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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