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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015a6f04e32679c34c3309243fd373e46783316a87d74e7f8967bc9969ca2385' 
  AND token = 'MkWTdaVxUMxFbr55iPs4Pb4VOivorxGoqYruYZwReyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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