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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29513ee01964d269dbe7eda1f59d6113b1e0aec07786ec008a07d43bacfa1cac' 
  AND token = 'YICf9/rEQsfbdveYgu7EoAYDaooDwbszcOE+CuFiSww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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