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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0596edb2661f42b3cbdd6bda870b05e3d8555212142abefa89262c5aaeeb7784' 
  AND token = 'w9nv7Ow+qyLbRLUCZf0qx0MOG5GeFUnOu24BSZnCQ+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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