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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6785321ed09e33e15a70317bac45eb5a230d5e9ef39077a3cb594f95bb0b1b' 
  AND token = '41F+e/ShazUOPnVRuxxI07I0imhdPSdgSuKkEQUqEE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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