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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17e513199b955befae3e399de3bae8aa83040d279cdd1d0d29a760ad8c60a52' 
  AND token = '6JbeIszHxFP8Pl2oGGUAhoTw2MNGEzI5ClGiAClOQNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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