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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448c8aa51ba447ffc9ba1b04b126962c74bab631b206a7ea0ae2b5dbaefac975' 
  AND token = 'Kyc1WIIgT1NtkdS1W6o4x/LR+Ta+H/cvP74prQ+PBkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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