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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904c3f71099bac637e9a9e1a15fce4d9a40dae0c86df9735ebfaa56a875dd8db' 
  AND token = 'dCs/pQPkfk8D23yjBDcGRkp3AeIVj+CjCeWAJEMWC6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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