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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27380f6820a0f1e1a64302279135e198d83e1e9704f216c6fac21528124757e4' 
  AND token = '2Z9ODjI7BoQ2icZzdbgzUQfspEkl/CvReYBjpsAsSLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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