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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a374901a6fe277b4d6368772c72a7b695e9efb1dabdae67d2f88aa544c6729' 
  AND token = 'dQLYgtbReiHO8vYwt1nNO78XlxjLbV1ocWV+w1H9/EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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