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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb28fb85835cd3ff733e5eb863c1de016d3ad78c4aca8887f6c82df2b9300c6' 
  AND token = '6quFfvRyJBPG3QHHwEU9Vy0KZemahyBly0nuLm6FwKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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