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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2079f8ac8a558891f27acc371c153c0a92398c5081b998c48ddf9bff1fa84d' 
  AND token = 'bf0xDHDwOhVwiXZmKJbkKQPlY0eKMVZZPwVgW1P9Fiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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