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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a4d140dce54c91345f5aecd6e9827171f70bc438ea75f6c3116f0cb121ee05' 
  AND token = 'pROlMT1DqNMdvEv9d5wpegKTfpG9UDt3eOJFwkZk608=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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