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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5314609b3d0c8cd61445e22debd4669f3647fb17759d017099473f6aace50347' 
  AND token = 'NAVAtI3rkBatfLhUiiUwNFevZkjPuiX2Zo3dfgWdUas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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