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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc018fe8e0f73b6496c709c34062c1d531e15c012eea6bbd76f842ed21b7e37' 
  AND token = 'T685N/b44urRg1AQKdVflvj3P/TdB728cRyQnKvQT9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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