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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef0caf4cd26c7e1b0778a499ff0278ace5a6c76fe58b693e71e71c94782ffbf' 
  AND token = 'klJJ6xVNKMJUBXpe48iFyU47HBPPzczAs6p0f0Q2aNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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