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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9ffc8d72a7a8c7c25d5ebd02245f6e4d02f224406fd39e60e234458c73ebb6' 
  AND token = '3kFugqGUMRRFDdRe8kkcchJ72gg9MI08282ZZzMkLa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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