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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c713e36d03e268bfb1b7e336570123421e8a73a25033ef9e762e11864ad4ef' 
  AND token = '5w/UjiwORyaw1U3akj3E1gFCHfebL3gJ+MaY1zqLD00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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