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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08160cd496ae18905419f8746648f89aeb1c54ad263bf5fec8a3eca9dcaa193a' 
  AND token = 'GO/j3RrdKkbWKUvdhd19QFZ2C/USVwCZuPi5/z9i4Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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