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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0575ae4d28170d45326a02fc7d560d65baff197ce5f366eb22758397bac6ae' 
  AND token = 'TzDeTHU9abRM2GHi8IUnHyDwpGRIyyvCdJhXpBOKaYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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