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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1a703e37313a5611f52b7ca2f2e3333b0ebdf7c68e2fd26aedf4eaad3e590f' 
  AND token = 'YlWXO6aO0UsVdWyV3FO67t3keIVSUm6K+S9CYpbOdbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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