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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b366be80643173e8c5ebf6c468ac3b34fc7bf8ef34ce2249aa11cb66ffabedaa' 
  AND token = '86Bkh2Y1oMAwo35UIy/C34vPiO8FE35cF3T652JvzPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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