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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0567b124f137081aba6c2bd3e166b467ac0f818cd8f9a0df1fd846b2daa710bc' 
  AND token = 'iP+ru4+V7g1ZYZktFgxgZrLy8IDm/gUiIG1JfWusPIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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