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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb7f29800c342fe608d9441fb52af6a63171d8486ad3741111cfd51d1e94fcc' 
  AND token = 'JiPdVXFdkKdAfyhH3tfMXPIbq7JjTw+on/yWTicNvQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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