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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca076a060e800e93c04b8b6b879800e3cae4e1803eae58f4f433b9bdadb85fe' 
  AND token = 'TxA8cwdaqEeS63fkaTMHttlWByqnCaUEQxPrpB/tCV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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