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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82da492c8eee872b7d59d18de116cd79fcd8c2fb3f6cb48185bafa868ee448fe' 
  AND token = 'GQ+Ri8Q02yLsijz8/j5qW5a/3Sve+wUcAiOT3woR1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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