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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758b10a66712a4b3d3ab8bce4f2479fe4a60440a8bbc40b96942586b944df0ed' 
  AND token = 'AFZXpXfRulkwC3XttAvdrdlIClqOvGL/FhlS/q7E6Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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