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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff521df42c4cd72685291fab8b5f483e8444e91f43f72435f43e87bba926a3a' 
  AND token = '1vF2Tw8C4jIZMbl2BywsLIPGYtQklEIZmSLsCBupZNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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