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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfee9fa6e4dd3f905d81960592d9d5bd3fe89c979aa44a55cad4b534893e25ec' 
  AND token = 'ywwqogLHf4D4JQUn6cFCc18LLeKX/Xm134ti/ToiDY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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