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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae8cfd03b389b8ec6852a0199c0af075fae0509a40f84c221af05ef85a22cb3' 
  AND token = 'ysliGKozP5AwCaTUncku/XHSYY2j5S/p9qDHZJu3ZNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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