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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de021d0e571414efe4e07bf88ac1fe779a65cd7aaba9de2457980117e712113d' 
  AND token = 'hgSwFjIA3jLStf7iEyb5oLL9Q7WO/6wYKjsdCsDSA5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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