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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd292836ae96fa3628ef05100306138782b9fa2a5ed4fc6e3494ca77bb83bef2' 
  AND token = 'OZkqPzwj0T3UjU9K7bYTOMg3S/4kwqOop8h3zYvM3co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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