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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857a54155fffafbcf997825f062d8164ccda8668267a7eb7b7dd14608fbe30fb' 
  AND token = 'Zb3ddN9KxjjQuCzo3YncG18Bk9rz82eCquNkY+nH1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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