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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c04ae17958e38346593c367bfb9106654bb52bea7307d94d9f3abfcafb3b93' 
  AND token = '0q9gdqpG/3/u7NutxDEHj8jkvCyg4LzPizyEhYU5Lmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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