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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f7ba3feb3aedc362be0a7b44444a0411eecc4b4902420175a4f817e5796e9e' 
  AND token = 'DuzzoxkxFcnk6iVKdsHUrH99QBD/QMi5Z8tV0o1OngA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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