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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78bbacf510bbb2ab7425a4bf11becc7575d987e0ed51ca74a5685e6fbff045a' 
  AND token = 'GBCKWVL356VaRet6//Cw/J3W1lenyyZcz9s/GFAk74k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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