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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b40198738e4fe1889175b21e89ccae02a5491563d1c323246ced1b28dc900e' 
  AND token = 'ExuhC+NlpTgVUQefkNCn32iVJq51CCtgpq6zp/4SHxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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