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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4870da77db2c7b0a980caad7f920ea183b0d136df13838c71a6428f83a05a62' 
  AND token = '0BJdzw+biyIKszgj7btnx7k97QMEYmzHHuZTPdP5bWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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