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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4792e373910ff5499bc984b6090b0e35d8a09d9b9625d316a853054cdc993942' 
  AND token = 'Zy0zvUQ2lzkSpqEQh7ih6omPsOgu3d3ikD5mb7CjlCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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