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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f531eeb08c49e9d774093a16f2a3b9e6c5539bf4930d40b3f553542d1a79d40' 
  AND token = 'n6Qjx3uqygUUR3C2/E+q/rJ6FbxAzaonW84oY4o+vJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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