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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a864416a0a9c53e085dc79ed07ce5a1b3e3ec0693691d2ff4e56257627093af' 
  AND token = 'DDQsqCv6kkrfTQvBMfT60mgky029hMoKhCPxMFj/B1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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