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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e060247a2c717ea9c6b74f262a55992fc443a22b20bc83cb0a95060bb7c2759' 
  AND token = 'bZpYmGOnWoNQcLZAKD+GhzCTlH9wxKJXeX2PLjDj9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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