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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf2c0ca6e94a99ec6b44aa6f3a45734c3f6679ddd61c5e6c131421a60d175d' 
  AND token = '5G8TM3rQgddhJYb+Y0f0eE5kWGdudFfrNbrMXQXuovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00195

JSON explain

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