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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08587ad387c9c5fbf8b248cefec1152a43c5a2460f927ef2fbd9efcd23a1876f' 
  AND token = 'sj5FLa7ihV8KS8lETG4vec/0smeTSDjBRuZXwdkMm5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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