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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1983223be3f023f4e60d6b2131f38580235d8c2bf7868f1d87bd67f3f1b2f8ab' 
  AND token = 'BCSC74oZBhazQscc2psg2ztIpjbzp0/ycI94M3jiri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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