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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9b0eaf83ecbd01a29602fa9029a56f473c8147ba551183263c8cb349851e59' 
  AND token = 'rV5ACaSOH2X5gS3KB57GO+ShBDiSD5yEEn4Svije+wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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