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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a555256b7631f8410dfc7a4379626fc084bb9a5ed554be1556dfa23699943' 
  AND token = 'haxjcgdNAkR3Wo8ohQLktrP3oKjwcFfLb58ZxufZ2JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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